This special issue is devoted to the Earth's mantle. It is launched for the occasion of the 17th International Symposium on Experimental Mineralogy, Petrology and Geochemistry hosted in Potsdam in June 2020, but the special issue is not restricted to the conference participants. It is open to any submissions on the following topics, among others:

• mineral phase stability and phase relations at upper and lower mantle conditions;
• melting from the uppermost mantle to the core-mantle boundary;
• mechanism of magma production and transport;
• fluid-rock and melt-rock reactions at mantle conditions;
• volatiles in the mantle, deep Earth volatile cycles;
• physical properties of mantle materials.

OH bonds are present in a wide variety of minerals in the form of structural units or as point defects. In this special issue we invite authors to submit papers providing overviews of recent research on OH in minerals. The reviews may address any specific aspects of OH in minerals: crystallography, speciation, impact on mineral properties, quantitative analyses, natural occurrence, geological implications, or any other relevant topics. This special issue is open to any kind of minerals, hydrous or anhydrous. Papers can focus on any specific envelope of the Earth from soil to the deepest part of the planet.

OH bonds are present in a wide variety of minerals in the form of structural units or as point defects. In this special issue we invite authors to submit papers providing overviews of recent research on OH in minerals. The reviews may address any specific aspects of OH in minerals: crystallography, speciation, impact on mineral properties, quantitative analyses, natural occurrence, geological implications, or any other relevant topics. This special issue is open to any kind of minerals, hydrous or anhydrous. Papers can focus on any specific envelope of the Earth from soil to the deepest part of the planet.

This special issue is devoted to the Earth's mantle. It is launched for the occasion of the 17th International Symposium on Experimental Mineralogy, Petrology and Geochemistry hosted in Potsdam in June 2020, but the special issue is not restricted to the conference participants. It is open to any submissions on the following topics, among others:

• mineral phase stability and phase relations at upper and lower mantle conditions;
• melting from the uppermost mantle to the core-mantle boundary;
• mechanism of magma production and transport;
• fluid-rock and melt-rock reactions at mantle conditions;
• volatiles in the mantle, deep Earth volatile cycles;
• physical properties of mantle materials.